Hi ilovelucid.
The method you are asking about is called VILD, and you can find it here. Further you are doing already pretty well, so dont be frustrated (if you are), getting lucid at night without WBTB is just a little harder. You can try to incubate dreams with the use of your dreamsigns and VILD, perhaps that would work, or you could try to use pure autosuggestion like repeating the sentence “when I see [insert dreamsign], I will know that I am dreaming” before you fall asleep (also a good combo with MILD). Anyway, good luck with it! 